Closes #544
Authored by: mbway

Closes #547

Reverts: https://github.com/yt-dlp/yt-dlp/pull/536/commits/892e31ce7c5f66418fee26a24eda30e5fe79d901

If some API calls have any issue, saving the state will cause unnecessary errors

This now seems to be completely dead
Closes: #553

Fixes #543
Authored by: colethedj

Fixes: https://github.com/yt-dlp/yt-dlp/pull/488#discussion_r674352059

:ci skip all

and fix some typos
Closes #538

Closes #507

Authored by: colethedj

* also adds `--no-cookies-from-browser`

Original PR: https://github.com/ytdl-org/youtube-dl/pull/29201
Authored by: mbway

Modified from and closes #441
Authored by: pukkandan, krichbanana

Authored-by: pukkandan, pyx

Closes #496
Co-authored-by: hheimbuerger, TpmKranz 

* `player_client` accepts multiple clients
* default `player_client` = `android,web`
* music clients can be specifically requested
* Add IOS `player_client`
* Hide live dash since they can't be downloaded

Closes #501

Authored-by: pukkandan, colethedj

Related: https://github.com/yt-dlp/yt-dlp/pull/488#discussion_r667527297

Related: https://github.com/yt-dlp/yt-dlp/issues/535#issuecomment-883277272, https://github.com/yt-dlp/yt-dlp/issues/518#issuecomment-881794754

Closes: https://github.com/yt-dlp/yt-dlp/issues/511#issuecomment-883024350
Authored by: colethedj

Related: #532, 7c365c21

Closes #520

since it's often confused to be the same as `format_note`

* Also fix bug where `_test_url` was being ignored

Ref: https://stackoverflow.com/a/20542029
Related: #340

* Allow skipping a level: `traverse_obj([{k:v1}, {k:v2}], (None, k))` => `[v1, v2]`
* Make keys variadic: `traverse_obj(obj, k1: str, k2: str)` => `traverse_obj(obj, (k1,), (k2,))`
* Fetch from multiple keys: `traverse_obj([{k1:[1], k2:[2], k3:[3]}], (0, (k1, k2), 0))` => `[1, 2]`

TODO: Add tests

* The thumbnail URLs are hard-coded and their actual existence is tested lazily
* Added option `--no-check-formats` to not test them

Closes #340, Related: #402, #337, https://github.com/ytdl-org/youtube-dl/issues/29049

Closes #495

Closes #530

Authored-by: mzbaulhaque 

* Update some `_extract_response` calls to keep them consistent
* Cleanup continuation extraction related code using new API format
* Improve `_extract_account_syncid` to support multiple parameters
* Generalize `get_text` and related functions into one
* Update `INNERTUBE_CONTEXT_CLIENT_NAME` with integer values

Authored by: colethedj

Fixes #522